body:not(.core-iframe-fullscreen):not(.core-reading-mode-enabled) .collapsible-header-page {
    --collapsible-header-progress: 0;
    --collapsible-header-collapsed-height: 0px;
    --collapsible-header-expanded-y-delta: 0px;
    --collapsible-header-expanded-height: 0px;
    --collapsible-header-floating-title-top: 0px;
    --collapsible-header-floating-title-left: 0px;
    --collapsible-header-floating-title-width: 0px;
    --collapsible-header-floating-title-x-delta: 0px;
    --collapsible-header-floating-title-width-delta: 0px;

    ion-header.core-header-shadow {
        --core-header-shadow: none;
    }

    .collapsible-header-expanded {
        overflow: hidden;
        flex-shrink: 0;
    }

    .collapsible-header-floating-title {
        position: absolute;
        top: 0;
        left: 0;
        opacity: 0;
    }

    &.collapsible-header-page-is-collapsed .collapsible-header-floating-title {
        pointer-events: none;
        user-select: none;
        visibility: hidden;
    }

    &:not(.collapsible-header-page-is-collapsed) .collapsible-header-collapsed {
        --core-header-toolbar-border-width: 0;
        --core-header-buttons-color: var(--text-color);
        --core-header-buttons-background: transparent;
        --core-header-toolbar-background: transparent;
        width: var(--collapsible-header-content-width, '100%');

        h1 {
            opacity: 0;
            pointer-events: none;
            user-select: none;
            visibility: hidden;
        }

    }

    &.collapsible-header-page-is-active.collapsible-header-page-is-collapsed.collapsible-header-page-is-within-content ion-header.core-header-shadow {
        --core-header-shadow: var(--drop-shadow-bottom, none);
    }

    &.collapsible-header-page-is-active {

        .collapsible-header-expanded {
            height: calc(var(--collapsible-header-expanded-height) * (1 - var(--collapsible-header-progress)));
            transform: translateY(calc(var(--collapsible-header-expanded-y-delta) * var(--collapsible-header-progress)));
            overflow: visible;

            @include core-transition(height transform, 200ms, linear);

            .collapsible-header-floating-title {
                opacity: 1;
                top: var(--collapsible-header-floating-title-top);
                left: var(--collapsible-header-floating-title-left);
                transform: translateX(calc(var(--collapsible-header-floating-title-x-delta) * var(--collapsible-header-progress)));
                width: calc(var(--collapsible-header-floating-title-width) + var(--collapsible-header-progress) * var(--collapsible-header-floating-title-width-delta));

                @include core-transition(width transform, 200ms, linear);
            }

            .collapsible-header-original-title {
                pointer-events: none;
                user-select: none;
                opacity: 0;
                visibility: hidden;
            }

            & > *:not(.collapsible-header-floating-title-wrapper),
            .collapsible-header-floating-title-wrapper > *:not(.collapsible-header-floating-title):not(.collapsible-header-original-title) {
                opacity: calc(1 - var(--collapsible-header-progress));

                @include core-transition(opacity, 200ms, linear);
            }

        }

    }

    &.collapsible-header-page-is-active.collapsible-header-page-is-within-content  {

        ion-content {
            --offset-top: var(--collapsible-header-collapsed-height) !important;

            > ion-refresher {
                z-index: 1;
            }
        }

        .collapsible-header-expanded {
            transform: none;
            height: auto;
        }

    }

    &.collapsible-header-page-is-active.collapsible-header-page-is-frozen {

        .collapsible-header-floating-title {
            display: none;
        }

        .collapsible-header-expanded .collapsible-header-original-title {
            opacity: 1;
            visibility: visible;
        }

    }

}

body.core-reading-mode-enabled .collapsible-header-page {
    .collapsible-header-original-title {
        display: none;
    }
}
